Furnace for melting metal



Dec. 13, 1938. m BANGLE 2,140,181

- FURNACE FOR MELTING METAL Filed Feb. 18, 1938 lllli'i" Gum/M114Patented Dec. 13, 1938 UNITED STATES PATENT OFFICE FURNACE FOR MELTINGMETAL Application February 18, 1938, Serial No. 191,307

1 Claim.

The object of my invention is to provide an improved furnace for foundrywork such as for melting iron, brass, copper, or any other metals whichit may be desirable to melt; and to provide a furnace which will giveclean iron free of cinders and flaws; and to provide a furnace of thistype which can be operated at low cost and which will produce intenseheat.

I attain the objects of my invention by the mechanism illustrated. inthe accompanying drawing, in which- Figure 1 is a perspective view ofthe invention, a portion being broken away and shown in section;

Fig. 2 is a detail view mainly in section of a portion of the furnacewall and the fuel and air conduits leading into same; and

Fig. 3 is a detail plan view of the circular fuel tube 4 and itsradiating fuel tubes 5.

Like numerals designate like parts in each of the several views.

Referring to the accompanying drawing, I provide a suitable source offuel supply such as a tank I from which a fuel pipe 2 extends, having ashut-off valve 3. The fuel pipe 2 communicates with a circular fuelconduit 4 in the fire-resisting bricked in wall I5 of furnace l6.Furnace I6 is open at the top.

Radiating from fuel conduit 4 are a multiplicity of fuel nozzles 5 whichare successively pointed upwardly, straight or linearly, and downwardly;those being pointed upwardly and downwardly are preferably disposed at asuitable angle such as 45 or 32 or 22 relative to the pipe 2. Fuelconduit 4 from which the nozzles radiate is circular and extendssubstantially the entire distance around the wall of the furnace, asshown in Fig. 3.

I provide a suitable motor 6 having a suitable drive shaft 7 whichdrives the fan or blower 8 by which air is forced through conduit 9 tothe circular air conduit II which is of larger diameter than concentricwith and encloses a similar circular fuel conduit 4.

Opening out of circular air conduit II are a multiplicity of air nozzles12 radiating successively in upwardly, straight or linearly, anddownwardly directions, as shown in Fig. 1, said nozzles l2 being oflarger diameter than the fuel nozzles 5 and concentric with andannularly spaced from said correspondingly radiating fuel nozzles 5.Externally to the air nozzles 12, I preferably provide outer cylindricallinings l3 for each of these air nozzles, as shown in Fig. 2.

The fuel nozzles 5 are mounted in a brick or clay lining [5 of thefurnace 16, as shown in Fig. 1. The conduits 4 and II are disposed abouteighteen inches from the bottom of the furnace and are mounted tightlyagainst the outside wall of the furnace, as shown.

It will be noted that by providing a multiplicity of radiating airnozzles 12 and fuel nozzles 5 opening out of the respective circularfuel conduit 4 and air conduit II that I secure nozzles operating in themanner of Bunsen burners and which will produce an intense heat in thefurnace. The air nozzles [2 are covered with cylindrical layers ofasbestos 13 to keep them from melting.

The amount of fuel flowing from tank I can be regulated by the valve 3and any suitable fuel may be used such as city gas, kerosene, crude oil,or carbide, with suitable adjustment of the apparatus such as cappingthe fuel outlet tube 5 and making a small hole for gas or carbide. Thefuel discharge tube can be set at the various angles shown to give anintense heat for melting metal.

To make a fire in the apparatus, a little gas is forced into the bottomand the fire started gently, or I may use a pan of waste soaked in fueland attached to a rod.

The furnace produces clean iron, free of cinders and flaws.

What I claim is:

In a furnace for melting metal, the combination of a furnace having asuitable fire-resisting lining such as brick or clay; a fuel tank; avalvecontrolled pipe leading from said tank; a circular fuel conduitmounted in the fire resisting lining of the furnace and with which saidfuel pipe communicates; a multiplicity of fuel nozzles radiatingupwardly, linearly, and downwardly, in succession from said circularpipe; an air pipe also leading into the furnace and of greater diameterthan and encircling a short portion of the fuel pipe; a circular airconduit of greater diameter than and encircling the aforesaid circularfuel conduit; and a multiplicity of air nozzles enclosing and of greaterdiameter than the corresponding fuel nozzles and correspondinglyradiating upwardly, linearly, and downwardly in succession from theaforesaid circular air condut; and a blower connected with and adaptedto force air through said air conduit and air nozzles, whereby toproduce a hot fiame, and to obtain metal free from cinders or flaws.

JOHN W. BANGLE.

